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EMI Cores

KEMET EMI Cores provide high-frequency noise suppression in electronic circuits. There are two ferrite material options for KEMET EMI Cores, namely Nickel-Zinc (NiZn) and Manganese Zinc (MnZn). The NiZn core material is typically effective for theMHz band range (FM-band frequencies), whereas the MnZn core material is typically effective for the kHz band range (AM-band frequencies). The MnZn core material offers a lower resistance compared to the NiZn and hence adequate insulation is required before use (recommended to measure the actual frequency-range effectiveness in the target application). The effective frequency range varies depending on core shape, size, and the number of turns.

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Types of Passive Components

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Part #

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 8.8mm

ESD-R-19B
KEMET
1: $4.22
692In Stock

Mfr. Part #
ESD-R-19B

Mouser Part #
80-ESD-R-19B

KEMET

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 8.8mm

Datasheet

692In Stock

$4.22

$2.19

$1.58

$1.55

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 15mm

ESD-R-25D-8
KEMET
1: $3.92
899In Stock

Mfr. Part #
ESD-R-25D-8

Mouser Part #
80-ESD-R-25D-8

KEMET

Ferrite Toroids / Ferrite Rings 15mm

Datasheet

899In Stock

$3.92

$2.03

$1.46

$1.42

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 61x33.2x25mm 300MHz Ni-Zn 120C

ESD-R-57N-H
KEMET
1: $32.53
57In Stock

Mfr. Part #
ESD-R-57N-H

Mouser Part #
80-ESD-R-57N-H

KEMET

Ferrite Toroids / Ferrite Rings 61x33.2x25mm 300MHz Ni-Zn 120C

Datasheet

57In Stock

$32.53

$17.16

$17.14

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Coated Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H

ESD-R-25SR-P
KEMET
1: $7.87
594In Stock

Mfr. Part #
ESD-R-25SR-P

Mouser Part #
80-ESD-R-25SR-P

KEMET

Ferrite Toroids / Ferrite Rings Coated Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H

594In Stock

$7.87

$4.03

$3.70

$3.69

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Toroidal w/case Nanocrystal Low Frequency 150kHz Ring -40/+120C UL94 V-0

ESD-R-412119H-NC23
KEMET
1: $28.12
212In Stock

Mfr. Part #
ESD-R-412119H-NC23

Mouser Part #
80-ESD-R-412119HNC23

KEMET

Ferrite Toroids / Ferrite Rings Toroidal w/case Nanocrystal Low Frequency 150kHz Ring -40/+120C UL94 V-0

212In Stock

$28.12

$21.51

$17.39

$16.72

$16.10

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-220814XH-R1
KEMET
1: $3.35
627In Stock

Mfr. Part #
ESD-R-220814XH-R1

Mouser Part #
80-ESD-R-220814XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

627In Stock

$3.35

$1.91

$1.61

$1.33

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Bare,Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability 10H

ESD-R-25SH
KEMET
1: $4.28
692In Stock

Mfr. Part #
ESD-R-25SH

Mouser Part #
80-ESD-R-25SH

KEMET

Ferrite Toroids / Ferrite Rings Bare,Toroidal Mn-Zn Low Frequency AM Band 150kHz Ring High permeability 10H

692In Stock

$4.28

$3.04

$2.31

$2.05

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Toroidal,Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H

ESD-R-25SR
KEMET
1: $6.67
143In Stock
300Expected 2026-07-23

Mfr. Part #
ESD-R-25SR

Mouser Part #
80-ESD-R-25SR

KEMET

Ferrite Toroids / Ferrite Rings Toroidal,Mn-Zn Low Frequency AM Band 150kHz Ring High permeability S15H

143In Stock

300Expected 2026-07-23

$6.67

$3.88

$3.39

$2.95

$2.65

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-291216XH-R1
KEMET
1: $4.22
334In Stock

Mfr. Part #
ESD-R-291216XH-R1

Mouser Part #
80-ESD-R-291216XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

334In Stock

$4.22

$2.46

$2.17

$1.78

$1.77

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-421617XH-R1
KEMET
1: $8.54
236In Stock

Mfr. Part #
ESD-R-421617XH-R1

Mouser Part #
80-ESD-R-421617XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

236In Stock

$8.54

$4.50

$3.89

$3.57

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal,Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-512419XH-R1
KEMET
1: $12.04
118In Stock

Mfr. Part #
ESD-R-512419XH-R1

Mouser Part #
80-ESD-R-512419XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal,Mn-Zn -40/+120C UL94 V-0 HR1

118In Stock

$12.04

$6.23

$5.52

$5.50

$5.30

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

ESD-R-613325XH-R1
KEMET
1: $30.32
71In Stock

Mfr. Part #
ESD-R-613325XH-R1

Mouser Part #
80-ESD-R-613325XH-R1

KEMET

Ferrite Toroids / Ferrite Rings High Heat Resistance with Case Toroidal Mn-Zn -40/+120C UL94 V-0 HR1

71In Stock

$30.32

$15.84

$15.83

$15.76

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-130527X-R1
KEMET
1: $4.03
1,297In Stock

Mfr. Part #
ESD-SR-130527X-R1

Mouser Part #
80-ESD-SR-130527X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

1,297In Stock

$4.03

$2.19

$1.88

$1.86

$1.47

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-150632X-R1
KEMET
1: $4.37
1,020In Stock

Mfr. Part #
ESD-SR-150632X-R1

Mouser Part #
80-ESD-SR-150632X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

1,020In Stock

$4.37

$2.57

$2.12

$1.84

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-160620X-R1
KEMET
1: $3.33
710In Stock

Mfr. Part #
ESD-SR-160620X-R1

Mouser Part #
80-ESD-SR-160620X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

710In Stock

$3.33

$1.89

$1.57

$1.35

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

ESD-SR-311337X-R1
KEMET
1: $11.95
43In Stock

Mfr. Part #
ESD-SR-311337X-R1

Mouser Part #
80-ESD-SR-311337X-R1

KEMET

Ferrite Toroids / Ferrite Rings Snap-on Ni-Zn High Frequency FM Band Split UL94 V-0 HR1

43In Stock

$11.95

$6.18

$6.06

$5.87

Min.: 1
Mult.: 1

Ferrite Cable Cores Ferrite Bead Core EMI 1mm

B-20L-25
KEMET
1: $0.403
54,088In Stock

Mfr. Part #
B-20L-25

Mouser Part #
80-B-20L-25

KEMET

Ferrite Cable Cores Ferrite Bead Core EMI 1mm

Datasheet

54,088In Stock

$0.403

$0.245

$0.188

$0.164

View

Min.: 1
Mult.: 1

Ferrite Cable Cores Ferrite Bead Core EMI 2.4mm

B-20L-48B
KEMET
1: $0.636
45,098In Stock

Mfr. Part #
B-20L-48B

Mouser Part #
80-B-20L-48B

KEMET

Ferrite Cable Cores Ferrite Bead Core EMI 2.4mm

Datasheet

45,098In Stock

$0.636

$0.417

$0.214

$0.183

View

Min.: 1
Mult.: 1

Ferrite Cable Cores Ferrite Bead Core EMI 4.8mm

B-20L-95B
KEMET
1: $1.09
10,587In Stock

Mfr. Part #
B-20L-95B

Mouser Part #
80-B-20L-95B

KEMET

Ferrite Cable Cores Ferrite Bead Core EMI 4.8mm

Datasheet

10,587In Stock

$1.09

$0.543

$0.394

$0.322

$0.321

Min.: 1
Mult.: 1

Ferrite Cable Cores 14x1mm Bare Ni-Zn for Flat Cable

ESD-FPL-18-8
KEMET
1: $5.77
1,235In Stock

Mfr. Part #
ESD-FPL-18-8

Mouser Part #
80-ESD-FPL-18-8

KEMET

Ferrite Cable Cores 14x1mm Bare Ni-Zn for Flat Cable

Datasheet

1,235In Stock

$5.77

$4.15

$3.18

$2.84

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 5mm

ESD-R-10D
KEMET
1: $0.744
12,175In Stock

Mfr. Part #
ESD-R-10D

Mouser Part #
80-ESD-R-10D

KEMET

Ferrite Toroids / Ferrite Rings 5mm

Datasheet

12,175In Stock

$0.744

$0.412

$0.336

$0.295

View

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings 25.5mm

ESD-R-47D-1
KEMET
1: $14.43
335In Stock

Mfr. Part #
ESD-R-47D-1

Mouser Part #
80-ESD-R-47D-1

KEMET

Ferrite Toroids / Ferrite Rings 25.5mm

Datasheet

335In Stock

$14.43

$8.14

$7.05

$6.56

Min.: 1
Mult.: 1

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm

ESD-R-47D-B
KEMET
1: $18.99
238In Stock

Mfr. Part #
ESD-R-47D-B

Mouser Part #
80-ESD-R-47D-B

KEMET

Ferrite Toroids / Ferrite Rings Ferrite Bead Incased EMI 25.5mm

Datasheet

238In Stock

$18.99

$10.57

$10.37

$9.07

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 9x39x20mm Ni-Zn 65C

ESD-SR-160
KEMET
1: $6.48
1,896In Stock

Mfr. Part #
ESD-SR-160

Mouser Part #
80-ESD-SR-160

KEMET

Ferrite Clamp On Cores 9x39x20mm Ni-Zn 65C

Datasheet

1,896In Stock

$6.48

$3.75

$3.21

$3.19

View

Min.: 1
Mult.: 1

Ferrite Clamp On Cores 8x20.5x20mm Ni-Zn 65C

ESD-SR-S16
KEMET
1: $5.22
2,796In Stock
1,960Expected 2026-04-27

Mfr. Part #
ESD-SR-S16

Mouser Part #
80-ESD-SR-S16

KEMET

Ferrite Clamp On Cores 8x20.5x20mm Ni-Zn 65C

Datasheet

2,796In Stock

1,960Expected 2026-04-27

$5.22

$2.68

$2.00

$1.98

Min.: 1
Mult.: 1